diff --git a/background/background-worker.js b/background/background-worker.js
index a1de9e76..630c33b0 100644
--- a/background/background-worker.js
+++ b/background/background-worker.js
@@ -1,4 +1,4 @@
-/* global workerUtil importScripts */
+/* global workerUtil importScripts parseMozFormat metaParser styleCodeEmpty colorConverter */
 'use strict';
 
 importScripts('/js/worker-util.js');
@@ -6,13 +6,11 @@ const {loadScript, createAPI} = workerUtil;
 
 createAPI({
   parseMozFormat(arg) {
-    /* global parseMozFormat */
     loadScript('/vendor-overwrites/csslint/parserlib.js', '/js/moz-parser.js');
     return parseMozFormat(arg);
   },
   compileUsercss,
   parseUsercssMeta(text, indexOffset = 0) {
-    /* global metaParser */
     loadScript(
       '/vendor/usercss-meta/usercss-meta.min.js',
       '/vendor-overwrites/colorpicker/colorconverter.js',
@@ -21,7 +19,6 @@ createAPI({
     return metaParser.parse(text, indexOffset);
   },
   nullifyInvalidVars(vars) {
-    /* global metaParser */
     loadScript(
       '/vendor/usercss-meta/usercss-meta.min.js',
       '/vendor-overwrites/colorpicker/colorconverter.js',
@@ -73,11 +70,10 @@ function compileUsercss(preprocessor, code, vars) {
 }
 
 function getUsercssCompiler(preprocessor) {
-  /* global colorConverter styleCodeEmpty */
   const BUILDER = {
     default: {
       postprocess(sections, vars) {
-        loadScript('/background/util.js');
+        loadScript('/js/sections-util.js');
         let varDef = Object.keys(vars).map(k => `  --${k}: ${vars[k].value};\n`).join('');
         if (!varDef) return;
         varDef = ':root {\n' + varDef + '}\n';
@@ -120,6 +116,7 @@ function getUsercssCompiler(preprocessor) {
     },
     uso: {
       preprocess(source, vars) {
+        loadScript('/vendor-overwrites/colorpicker/colorconverter.js');
         const pool = new Map();
         return Promise.resolve(doReplace(source));
 
diff --git a/background/util.js b/background/util.js
deleted file mode 100644
index 1bd2f0f5..00000000
--- a/background/util.js
+++ /dev/null
@@ -1,24 +0,0 @@
-'use strict';
-
-const RX_NAMESPACE = /\s*(@namespace\s+(?:\S+\s+)?url\(http:\/\/.*?\);)\s*/g;
-const RX_CHARSET = /\s*@charset\s+(['"]).*?\1\s*;\s*/g;
-const RX_CSS_COMMENTS = /\/\*[\s\S]*?(?:\*\/|$)/g;
-
-function styleCodeEmpty(code) {
-  // Collect the global section if it's not empty, not comment-only, not namespace-only.
-  const cmtOpen = code && code.indexOf('/*');
-  if (cmtOpen >= 0) {
-    const cmtCloseLast = code.lastIndexOf('*/');
-    if (cmtCloseLast < 0) {
-      code = code.substr(0, cmtOpen);
-    } else {
-      code = code.substr(0, cmtOpen) +
-        code.substring(cmtOpen, cmtCloseLast + 2).replace(RX_CSS_COMMENTS, '') +
-        code.substr(cmtCloseLast + 2);
-    }
-  }
-  if (!code || !code.trim()) return true;
-  if (code.includes('@namespace')) code = code.replace(RX_NAMESPACE, '').trim();
-  if (code.includes('@charset')) code = code.replace(RX_CHARSET, '').trim();
-  return !code;
-}
diff --git a/js/sections-equal.js b/js/sections-equal.js
index d01c4bfe..95dcf68f 100644
--- a/js/sections-equal.js
+++ b/js/sections-equal.js
@@ -1,5 +1,28 @@
 'use strict';
 
+const RX_NAMESPACE = /\s*(@namespace\s+(?:\S+\s+)?url\(http:\/\/.*?\);)\s*/g;
+const RX_CHARSET = /\s*@charset\s+(['"]).*?\1\s*;\s*/g;
+const RX_CSS_COMMENTS = /\/\*[\s\S]*?(?:\*\/|$)/g;
+
+function styleCodeEmpty(code) {
+  // Collect the global section if it's not empty, not comment-only, not namespace-only.
+  const cmtOpen = code && code.indexOf('/*');
+  if (cmtOpen >= 0) {
+    const cmtCloseLast = code.lastIndexOf('*/');
+    if (cmtCloseLast < 0) {
+      code = code.substr(0, cmtOpen);
+    } else {
+      code = code.substr(0, cmtOpen) +
+        code.substring(cmtOpen, cmtCloseLast + 2).replace(RX_CSS_COMMENTS, '') +
+        code.substr(cmtCloseLast + 2);
+    }
+  }
+  if (!code || !code.trim()) return true;
+  if (code.includes('@namespace')) code = code.replace(RX_NAMESPACE, '').trim();
+  if (code.includes('@charset')) code = code.replace(RX_CHARSET, '').trim();
+  return !code;
+}
+
 /**
  * @param {Style} a - first style object
  * @param {Style} b - second style object
diff --git a/manage.html b/manage.html
index df581f3f..6c3bf5ab 100644
--- a/manage.html
+++ b/manage.html
@@ -163,7 +163,7 @@
   <script src="manage/import-export.js" async></script>
   <script src="manage/incremental-search.js" async></script>
   <script src="msgbox/msgbox.js" async></script>
-  <script src="js/sections-equal.js" async></script>
+  <script src="js/sections-util.js" async></script>
   <script src="js/storage-util.js" async></script>
 </head>
 
diff --git a/manifest.json b/manifest.json
index fe679032..e0c393c0 100644
--- a/manifest.json
+++ b/manifest.json
@@ -25,9 +25,8 @@
     "scripts": [
       "js/messaging.js",
       "js/storage-util.js",
-      "js/sections-equal.js",
+      "js/sections-util.js",
       "js/worker-util.js",
-      "background/util.js",
       "background/storage-dummy.js",
       "background/storage.js",
       "js/prefs.js",